Hey, I don't know if it is my laptop, but I have a problem loading up a save with a city full over than 700, it just freezes the game. If course, it is in easy mode, and the lag of vikings also add up stuttering as well.
Whereas if I load up a previous one with little population (20+), the save loads up okay, but little but slower than usual.

I have scaled the map to 200% with natural.

I know I see there's workaround, but I don't know if it is related, as I have deleted all the mods including this one, and loaded up an old save of different map with 3k+ pop (and it did open).

04/05/2020:

Found out the mod causing for the freezing, so all is good. I apologize for inconvenience and have a great day!